Round

Round a single-precision floating-point number to the nearest integer.

Usage

var roundf = require( '@stdlib/math/base/special/roundf' );

roundf( x )

Rounds a single-precision floating-point number to the nearest integer.

var v = roundf( -4.2 );
// returns -4.0

v = roundf( -4.5 );
// returns -4.0

v = roundf( -4.6 );
// returns -5.0

v = roundf( 9.99999 );
// returns 10.0

v = roundf( 9.5 );
// returns 10.0

v = roundf( 9.2 );
// returns 9.0

v = roundf( 0.0 );
// returns 0.0

v = roundf( -0.0 );
// returns -0.0

v = roundf( Infinity );
// returns Infinity

v = roundf( -Infinity );
// returns -Infinity

v = roundf( NaN );
// returns NaN

Notes

Ties are rounded toward positive infinity.

Examples

var randu = require( '@stdlib/random/base/randu' );
var roundf = require( '@stdlib/math/base/special/roundf' );

var x;
var i;

for ( i = 0; i < 100; i++ ) {
    x = ( randu() * 100.0 ) - 50.0;
    console.log( 'Value: %d. Rounded: %d.', x, roundf( x ) );
}

C APIs

Usage

#include "stdlib/math/base/special/roundf.h"

stdlib_base_roundf( x )

Rounds a single-precision floating-point number to the nearest integer.

float out = stdlib_base_roundf( -4.2f );
// returns -4.0f

The function accepts the following arguments:

x: [in] float input value.

float stdlib_base_roundf( const float x );

Examples

#include "stdlib/math/base/special/roundf.h"
#include <stdio.h>

int main( void ) {
    const float x[] = { -5.0f, -3.89f, -2.78f, -1.67f, -0.56f, 0.56f, 1.67f, 2.78f, 3.89f, 5.0f };
    
    float v;
    int i;
    for ( i = 0; i < 10; i++ ) {
        v = stdlib_base_roundf( x[ i ] );
        printf( "roundf(%f) = %f\n", x[ i ], v );
    }
}